Just bought an old condo unit 2 months ago and now that it's getting colder, I'm wrestling with a steam system that isn't quite up to snuff. I just finished reading The Lost Art, and am trying to fix things before the cold truly sets in. I've turn down the pressuretrol to 0.5 psig (was previously at 12 psig), and am waiting on replacement air valves for the mains to arrive.
Once I've got the mains venting well, I want to replace the radiator air vents (3/4 of which are clogged beyond repair). I'm looking to get a better understanding of my radiators, their "type" (cast-iron column, cast-iron tube, etc.) their capacities (EDR) so that I can size vents relatively closely the first time.
There are 6 radiators (note clicking on pictures will open a new tab with a larger image):
29"W x 28"H x 4.5"D
38"W x 20"H x 8"D
39"W x 20"H x 8"D
9"W x 28"H x 5"D
26"W x 20"H x 6"D
23"W x 22"H x 7"D
Any help you can provide would be greatly appreciated!